3Com Switch 8800 Family Configuration Guide

346 CHAPTER 32: INTEGRATED IS-IS CONFIGURATION
By default, the interface priority is 64. If the level-1 or level-2 is not specified, it
defaults to setting the priority of Level-1.
Setting Router Type Based upon the position of the router, the levels can be divided into Level-1
(intra-domain router), Level-2 (inter-domain router) and Level-1-2 (that is,
intra-domain router as well as inter-domain router).
Perform the following configuration in IS-IS view.
By default, the router type is level-1-2.
Setting Interface Circuit
Level
Perform the following configuration in Interface view.
n
Only when the router to which the interface belongs is of Level-1-2 type, is the
modification to the interface circuit level meaningful. Otherwise, the type of the
router determines the level of adjacency relation.
You can set the circuit level to limit what adjacency can be established for the
interface. For example, Level-1 interface can only have Level-1 adjacency. Level-2
interface can only have Level-2 adjacency. For the Level-1-2 router, you can
configure some interfaces to Level-2 to prevent transmitting Level-1 Hello packets
to Level-2 backbone so as to save the bandwidth. However, Level-1 and Level-2
use the same kind of Hello packet over the p2p link, and therefore such setting is
unnecessary in this case.
By default, the circuit-level on the interface is level-1-2.
Configuring IS-IS to
Import Routes of Other
Protocols
For IS-IS, the routes discovered by other routing protocols are processed as the
routes outside the routing domain. When importing the routes of other protocols,
you can specify the default cost for them.
When IS-IS imports routes, you can also specify to import the routes to Level-1,
Level-2 or Level-1-2.
Tabl e 311 Set priority for DIS election
Operation Command
Set the priorities for DIS election on the
interface
isis dis-priority value [ level-1 | level-2 ]
Restore the default priorities for DIS election
on the interface
undo isis dis-priority [ level-1 | level-2 ]
Tabl e 312 Set the router type
Operation Command
Set the router type is-level { level-1 | level-1-2 | level-2 }
Restore the default router type undo is-level
Tabl e 313 Set the interface circuit level
Operation Command
Set the interface circuit level isis circuit-level [ level-1 | level-1-2 | level-2 ]
Restore the default interface circuit level undo isis circuit-level